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Unformatted text preview: Review Problems for Final Exam 09-106 Fall 2009 (with selected answers) 1 I. For the following statements, circle T if the statement is TRUE and F if it is FALSE. T F 1. If a process is spontaneous, the reverse process is nonspontaneous. T F 2. If a process increases the randomness of the system, the process is spontaneous. T F 3. ∆ H, ∆ G, and ∆ S are all equal to zero for a chemical reaction at equilibrium. T F 4. For the reaction CH 4 (g) + 2 O 2 (g) barb2right CO 2 (g) + 2 H 2 O(l), ∆ H < ∆ U. T F 5. At a given temperature and pressure, ethane (CH 3 CH 3 ) has a greater standard molar entropy than ethene (CH 2 =CH 2 ). T F 6. ∆ U can be calculated only for constant pressure processes. T F 7. Processes in which entropy increases and enthalpy decreases are spontaneous at all temperatures. T F 8. For a gas expansion between two given volumes, reversible work is less than irreversible work between the same volumes. T F 9. The Third Law of Thermodynamics indicates that S m º for any element is 0. T F 10. A substance that has a negative ∆ G f º is thermodynamically unstable. T F 11. For a gas expansion between two given volumes, Δ S sys for the reversible process is equal to Δ S sys for the irreversible process between the same volumes. T F 12. If an equilibrium reaction has a K < 1, its reverse reaction is spontaneous as written. T F 13. If Q > K at a given temperature, a reaction proceeds toward products in order to re-establish equilibrium. T F 14. For the reaction CO(g) + H 2 O(g) barb2leftbarb2right CO 2 (g) + H 2 (g), Δ H = Δ U. T F 15. As the strength of an acid increases, the strength its conjugate base decreases. T F 16. A saturated solution has the rate of solute particles leaving the solid surface equal to the rate of their returning to the solid surface. T F 17. The solubility of salt MX ( K sp ) in water will always be less than that of salt MX 3 ( K sp ’), provided that K sp < K sp ’. T F 18. In an aqueous solution of a strong acid, [OH- ] = 0. Review Problems for Final Exam 09-106 Fall 2009 (with selected answers) 2 T F 19. CaO is an acidic oxide. T F 20. The strongest acid that can exist in liquid H 2 O is H 3 O + T F 21. HCOOH is a weak acid and a poor conductor of electricity when dissolved in water. T F 22. In the reaction SO 2 (g) + OH- (aq) barb2right HSO 3- (aq), SO 2 is a Lewis acid. T F 23. When a diprotic weak base is titrated with a strong acid, the pH at the first equivalence point is always < 7. T F 24. For a buffer containing a base B and its conjugate B-H + , if [B] > [B-H + ] the buffer pH will be less affected by the addition of H 3 O + . T F 25. The frequency factor A is constant for a given reaction pathway....
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This note was uploaded on 08/25/2011 for the course CHEMISTRY 09-106 taught by Professor Vuocolo during the Spring '09 term at Carnegie Mellon.
- Spring '09